It is basically a semi auto version of a .44mag using .45 cal bullets. I used to have one in a Grizzly pistol which is a 1911 on steroids, many of the parts are interchangable except for the frame and slide. Excellent caliber but ammo and reloading componets are more expensive then 44mag just from a volume standpoint. Worked great in the Grizzly and I have heard that it works well in the AR platform also. HTH